The ZTE Open is a very rare thing indeed. After just three days of being on sale on eBay, the £59.99 handset has already sold out.

Our time with the Open was very limited, so don't consider this to be a full review by any means - that will come later. What we can do, however, is offer our first impressions of the new Firefox phone.

In the hand, this is quite clearly a £59 handset. It isn't super thin or lightweight, and the screen is low resolution enough for it not to be hugely impressive, but for the money we wouldn't expect otherwise.

The build is nice and sturdy, however, and it feels like the hardy smartphones of old. We can see the ZTE Open surviving as many drops as a Nokia 3310.

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The matte plastic back on the handset also looks rather good, particularly in the white version that we used. Seeing the Firefox logo rather than Google or Apple also makes for a nice change.

We would have liked to photograph the orange version of the phone as well, but sadly it wasn't available.

On the bottom of the phone's 3.5-inch screen is a single white circle which illuminates when you touch it. This is used to exit apps and go back to the home screen, with a long press opening up a multitasking menu.

Despite having just a 1GHz single-core processor and 256Mb of RAM, the phone didn't feel hugely laggy either, although we really needed to put it through its paces more to test its capabilities.